Originally Posted by
wrench1
For one, none of the powered-lift aircraft are considered transport category so it would have been Part 23 and Part 27. Unfortunately to use those regulatory parts for an eVTOL or AW609 certification would require an excessive amount of exemptions and other work arounds.
wrench1,
The AB 350 was certified under Part 25.1309 which requires system safety analysis proving <E-9 probably of catastrophic failure. Part 29.1309 for rotorcraft has similar section to meet the CAT A performance requirement. These section requirements for system safety are not included in 23 and 27.
If Lillium is claiming that they are as safe as an AB 350, (or a 609) they need to show they meet the requirements laid out in 1309 for Probability of catastrophic failure.